no, it's surely not, considering I made just a quick test a few months ago in a Spit Ia and it behaved exactly as advertised in a real performance graph. That was at a time where those people here had a major rant about why they couldn't reproduce the plane's max speed (as in absolute max) at sea level resp. "at about 1000 feet". Well, they've got that figured out as of now but I wouldn't exactly think of them as test pilots...
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